A few bad reviews on here, which I find slightly baffling. I can only suggest that some of the people who signed up for the service aren't sure how to monitor backlinks properly.
I found that the service was swift and effective. Of course the links aren't on the best sites around but what do you expect for $75? My rankings have improved as has the number of backlinks I have and that's what I wanted.
All in all superb value for money, just make sure you understand what you're doing before committing your cash.